Combined step and extension ladder.



No. 739,309. PATBNTED SEPT. 22, 1903. E. L. ,HARMON. COMBINED STEP AND EXTENSION LADDER.

. APPLICATION "FILED FEB. 6.1903.

R0 MODEL.

' UNITED STATES Patented September 22, 1903.

ELMER L. HARMON, OF SHERADEN, PENNSYLVANIA.

COMBINED STEP AND EXTENSION LADDER.

SPECIFICATION forming part of Letters Patent No. 739,309, datedseptember 22,1903. Application filed February 6, 1903. Serial No. 142,109. (No model.)

To all whom it may concern;

Be it known that I, ELMER L'. HARMON, a citizen of the United States, residing at Sheraden, in the county of Allegheny and State of Pennsylvania, have invented a new and useful lmprovement in a Combined Step and Extension Ladder, of which improvement the following is a specification,

This invention relates to an improved combination step and extension ladder; and it consists in the certain details of construction and combination of parts, as will be fully described hereinafter.

In the accompanying drawings, Figure 1 is a side sectional elevation of my improved combination step and extension ladder, the same being constructed and arranged in accordance with my invention. Fig. 2 is afront elevation of thesame, showing in dotted lines the position of the extension. Fig. 3 is an enlarged side sectional elevation of a portion of the top of the ladder, showing the means of adjusting the rear leg of the ladder to the several positions. Fig. 4is a perspective view of a portion of the rear leg, showing the means of attachment with the adjusting-plates.

To construct a combination step and extension ladder in accordance'with my invention, I form from wood the side rails 1 and fit the same in the usual manner with a series of steps 2 and topor cap piece 3. Attached to these side rails 1 near the top are two plates 4, formed on their inner sides with slots 5 and a number of notches 6, the same being inclined upward, as shown at Figs. 1 and 3 of the drawings. I now form a rear leg 8, fitted with a suitable number of rungs 9, the top rung 11 of which projects at either side of the said leg, as shown at 11, Fig. 4, the said ends adapted to engage with the notches 6,.

' and thereby lengthen or shorten the said leg,

' to the under side of the top of the ladder. V

By this construction of a ladder the same may be used in various positions, the rear leg made shorter or longer than the front of the ladder, as circumstances.require,-or 'an extension-ladder formed as above described, and by reason of the peculiar construction of the rear leg the ladder will have a more solid footing upon uneven surfaces.

Various slight modifications and changes may be made in the details of construction without departing from the spirit of the invention.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is-

1. A device of the type set forth comprising a main ladder, a secondary ladder pivotedtheretoat the top of the same and adapted to substantially as described.

2. A device of the type set forth, comprising a main ladder, a secondary ladder adapted to serve as a leg therefor, said secondary ladder being adj ustably and pivotally secured to the main ladder, means carried by the last-named ladder adapted to be engaged by the secondary ladder comprisinga pair of plates having upwardly-inclined notches therein, and slots formed in the same, and integral means projecting laterally from the secondary ladder for engagement with the slots in said plates, and means on said last-named ladder for engagement with the notches in the plates, substantially as" described.

In testimony whereof I have hereunto signed my name in thepresence of two subscribing witnesses.

- ELMER L; HARMON. .In presence of f JOHN GROETSINGER, M. E. HA RIsoN. 

